Microphone not working with Google Hangout

this worked for me:

I had to manually rest the audio daemon on my computer. I have a macbook air though so it might be different for you?

(1) Type in the search bar "Terminal" and click the Terminal utility - it should be a black box icon looking thing.

(2) Type in "sudo killall coreaudiod" into the Terminal black box thingy that pops up.

(3) It'll automatically show a warning sign and tell you to enter your computers password. (To be honest, I didnt know what the warning sign meant. But I was desperate to try anything after searching close to an hour for an answer to this problem.)

(4) Type in your computer password.

(5) Restart the google hangout application by exiting out and opening it again.

(6) Try calling someone again and see if it works! Hope it does :/

https://productforums.google.com/forum/#!msg/hangouts/s7aHXZChsaM/gWJ0QBVp4XUJ

On a Mac, it was the FaceTime app. I had to quit FaceTime, restart Chrome, and all was well.

Until... recently. Now, I get the camera working but the audio is still reported as being "hardware muted"...

Edit:

It seems that it's an issue in Chrome 37:

https://productforums.google.com/forum/#!topic/hangouts/vb-zDwFnARY

Google Support said that in the mean time, this work around might fix it:

Please try adjusting your mics' sample rate (on Macs, this would be via the "Audio MIDI Setup") to 48, 44.1, 32 or 16kHz.

I would suggest looking into the Hangout Settings first.

Then check the properties of your recording devices and see if it will let you reduce the sound quality, sample rate, etc. The idea here is to make the sound data being transmitted over your Internet connections smaller, thus easier for a poor connection to handle. Depending on you OS & hardware, there may be few settings which can be adjusted. On the other hand, some high end sound devices allow a lot of customization.

Sorry this answer is vague, but you didn't give us much detail to work with.